Thanks Rich! Quick response. I see how it ia not so good visually
compared to a listening test. Spark is more usable for this purpose -
and easy to get!
and gee, look at that HF hiss...
Thanks,
<L>
Lou Judson =95 Intuitive Audio
415-883-2689
On Mar 23, 2007, at 3:03 PM, Rich Peet wrote:
> Yes keys do have ultrasonics too. It is such a complex signal that it
> leads to an easy ear check of a recording system.
>
> Too complex and long to give a good paper trail. The key compared to
> the spark have some things in common but on the amptitude display I
> also see strong different harmonics that I don't see on the spark.
>
> My car keys recorded at 3 inches. The spark was recorded at 1 foot.
> In the linked photo I have the key jingle first and then I have
> appended three separate spark sounds. Same mic, same recorder, etc.
> http://home.comcast.net/~richpeet/keyspark.jpg
>
> For measurement of attenuation of different frequencies for my wind
> blimp I think I am better off with the spark. But am open to
> suggestions as I just hack at this.
>
> Rich Peet
>
> Rich Peet
> --- In Lou Judson <>
> wrote:
>>
>> Have you tried a key jangling test the same way? I'd be curious to see
>> a similar image from that, the traditional test used for mic pre
>> distortion - care to do a comparison? Certinly safer than the spark,
>> is
>> it as effective?
>>
>> How close was the spark to the mics?
>>
>> <L>
>>
>> Lou Judson =95 Intuitive Audio
>> 415-883-2689
>>
>> On Mar 23, 2007, at 11:32 AM, Rich Peet wrote:
>>
>>> How high will a standard mic go.
>>>
>>> Someone else with more experience than me would have to comment on
>>> what the freq response curve of a gas grill bbq piezo starter is but
>>> it seems to go into RF frequencies.
>>>
>>> Testing two standard mics with the bbq starter I noted that on
>>> multiple sparks that the spectrum display looks identical each time.
>>> Then changing mics I get a different pattern that once again does not
>>> change from spark to spark. So I conclude that an electrical spark
>>> is
>>> a way to check the freq capability of your equipment. I have no idea
>>> if this method could be dangerous to electronic devices and would not
>>> be surprised if there is a risk.
>>
>
>
>
>
> "Microphones are not ears,
> Loudspeakers are not birds,
> A listening room is not nature."
> Klas Strandberg
> Yahoo! Groups Links
>
>
>
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